Portuguese Zanzibar

Portuguese Zanzibar (1857-) was a territory of the Portuguese Empire acquired on 15 February 1857 from the Ethiopian Empire. On 17 February 1857 the peace deal between the two countries was secure, giving Portugal control of the small island of Zanzibar, formerly an island of Oman that lay between the Horn of Africa and Arabian Peninsula. Due to its petty worth, Ethiopia easily gave it up.

History
The island of Zanzibar, which lay between the Horn of Africa and the Arabian Peninsula, historically belonged to Oman, and was conquered by the Ethiopian Empire in the 1844-1850 Ethiopian-Omani War along with the rest of Oman's empire. Ethiopia made it Ethiopian Zanzibar on 12 August 1852 as a non-slave state, which was far from the main empire.

In 1857, as Ethiopia warred with Spain over Ethiopian Eritrea, Portugal declared war on Ethiopia, claiming Zanzibar as their lands. Ethiopia did not want to wage war with European forces on two fronts and on 15 February 1857 offered Zanzibar to Portugal peacefully. On 17 February 1857 Portugal accepted, and the island changed hands.